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碳酸盐岩气藏不仅容易产生裂缝，而且溶洞也发育得非常普遍。裂缝－溶洞型气藏的流体滤失与普通均质气藏的滤失存在明显的差异，均质气藏滤失主要由基质和流体性能参数确定，而缝洞型气藏滤失受裂缝和溶洞控制。现有的滤失计算模型是针对均质储层而建立的，不能用于缝洞型气藏压裂液的滤失计算。文章基于缝洞型储层的滤失特征，提出了由两类连通性差的孔隙介质和连通性好的裂缝介质组成的三重介质物理模型来描述缝洞型气藏压裂液滤失，建立了一套新的计算缝洞型气藏压裂液滤失的数学模型，给出了模型的解析解，并进行了示例计算。文章的建模思路与模型解法可推广应用于解决多重介质的滤失及渗流问题。

New Model of Fracturing Fluid Leak-off for Carbonate Gas Reservoirs with Fractures and Dissolved Caves

Fractures and dissolved caves are easily developed in carbonate gas reservoirs. Fluid leak-off of gas reservoirs with fractures and dissolved caves appears obvi ously different from fluid leak-off of conventional isotropic gas reservoirs. The leak-off of isotropic gas reservoirs depends mainly on matrix and fluid parameters. And the leak-off of gas reservoirs with fractures and dissolved caves is controlled by fractures and dissolved caves. The existing models for leak-off simulation are based on isotropic reser voirs, which can't be used to calculate the fracturing fluid leak-off for gas reservoirs with fractures and dissolved caves. According to the leak-off characteristics of reservoirs with fractures and dissolved caves, the tri-medium physical model with 2 poor connecting porous media and the good connecting fractured medium is developed to describe the fracturing fluid leak-off of gas reservo'irs with fractures and caves. And a set of mathematic models to calculate the fracturing fluid leak-off of gas reservoirs with fractures and dissolved caves are established. The analytical solution is given for the models. Example calculation is demonstrated. The mathematical models and their solution method can also be used to solve the problems of multi-media leak-off and percolation.